For Bioretention Facilities Dan Cloak Environmental Consulting May 23, 2011.

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Presentation transcript:

for Bioretention Facilities Dan Cloak Environmental Consulting May 23, 2011

 Why such emphasis on bioretention?  Criteria for hydrologic performance and NPDES compliance  Area and volume requirements  Discharge orifice requirements and outlet design  Soil specification  Additional Design Specifications  Gravel and underdrain  Plantings  Structural

 Sizing Factor for Treatment Only  A ≥ 0.04  Sizing Factors for Treatment + Flow Control  3 factors  Vary with soil type and rainfall record (location)  A is the wetted surface area of the bioretention soil mix  V 1 is the surface storage at overflow stage  V 2 is the free volume within the gravel layer

Surface Loading Rate i = 0.2 inches/hour i = 5 inches/hour BMP Area/Impervious Area = 0.2/5 = 0.04

A 18"

Facility DesignSoil Group Area A (ft 2 /ft 2 ) Volume V 1 (ft 3 /ft 2 ) Volume V 2 (ft 3 /ft 2 ) Rainfall Adjustment for Surface Area Rainfall Adjustment for Storage Volume Maximum Release Rate Bioretention Facility A No min.Eq. 4-6 No orifice B No min.Eq. 4-7 No orifice C Eq. 4-8 Eq D Eq. 4-9*Eq. 4-9Eq Flow- through Planter ANot permitted in “A” soils BNot permitted in “B” soils C Eq. 4-8 Eq D Eq. 4-9*Eq. 4-9Eq Dry Well A N/AEq. 4-6 No release B N/AEq. 4-7 No release CNot permitted in “C” soils DNot permitted in “D” soils Cistern + Bioretention A N/AEq. 4-13Eq. 4-6Eq B N/AEq. 4-14Eq. 4-7Eq C N/AEq. 4-15Eq. 4-8Eq D N/AEq. 4-16Eq. 4-9Eq Bioretention + Vault A0.04N/A0.096N/AEq. 4-6No release B0.04N/A0.220N/AEq. 4-7Eq C0.04N/A0.152N/AEq. 4-8Eq D0.04N/A0.064N/AEq. 4-9Eq Page 44

Soil Mix Gravel 18" 10" 2"2" Overflow A V1V1 V2V2 Φ = 0.4

Soil Mix Gravel 18" 10" 2"2" Under drain 6"6" A V1V1 V2V2 Page 70

Soil Mix 18" 10" 2"2" Page 71

Page 76 Overflow elevation

 See Appendix B – Use Mix “B”  60-70% Sand  ASTM C33 for fine aggregate  30-40% Compost  Certified through US Composting Council Seal of Testing Assurance Program  Issues since initiating a design specification  Suppliers may still be using a performance specification  Performance of non-spec materials starts out OK, then falls off with repeated wettings  Failures seem to correlate with observable presence of clays Page B-3

 Class 2 permeable  Caltrans spec  Typical to be slightly off gradation spec on delivery  No filter fabric  Underdrain  PVC SDR 35 or equivalent  Holes facing downward  Solid pipe for 2' closest to outlet structure  Cleanout Pages 71-72

 List in Attachment B-1  Use experienced professionals  Trees  Incorporate into bioretention facility  Account for surface roots  Consider multi-purpose  Lawns or working gardens  Flooding is brief and only in winter Page B-7 Page 73

 Outlet structure  Top of overflow grate  Invert of subdrain  Inlet  Flow line at inlet  Top of curb  Top of adjacent paving  Soil layers  Top of soil layer  Bottom of gravel layer  Bottom of soil layer Page 94

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